There's the answer! The rest of Nat's post is so informative, but for your question, this is the answer I wish my head would have come up with in the beginning!If your homemade feed is the same as the scratch, then you can use it as scratch (limited amount only), but you cannot use it for the main food and expect your chickens to be healthy.
Kalmbach's Flock Maker is good feed. Use yours for the scratch and there you go!